﻿using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Media;

namespace SHomeWorkshop.LunarMind.Adorners
{
    public class CommentAdorner : Adorner
    {
        /// <summary>
        /// 用在标题备注文本显示时的装饰器。
        /// </summary>
        /// <param name="adornedElement">应传入备注文本块。</param>
        public CommentAdorner(Title masterTitle, UIElement adornedElement)
            : base(adornedElement)
        {
            commentTextBlock = adornedElement as TextBlock;
            this.masterTitle = masterTitle;
            //this.Opacity = 0.5;

            //终于解决了选取装饰器中线条宽度为2而不是1像素的问题！！！
            this.SnapsToDevicePixels = true;
            this.SetValue(RenderOptions.EdgeModeProperty, EdgeMode.Aliased);
        }

        private Title masterTitle;

        private TextBlock commentTextBlock;

        protected override void OnRender(DrawingContext drawingContext)
        {
            if (masterTitle == null) return;

            Brush renderBrush = LunarConcept.Tools.BrushManager.SevenColors;   //commentTextBlock.Foreground;
            Pen renderPen = new Pen(commentTextBlock.Foreground, 1);

            double fontSize = commentTextBlock.FontSize;

            double ptaY = commentTextBlock.ActualHeight / 2;

            if (Globals.MainWindow.View != ViewMode.Default || masterTitle.Direction == TitleDirection.Right)//只有导图会分左右。
            {
                Rect newRect = new Rect(-fontSize, ptaY - fontSize / 2, fontSize * 0.8, fontSize);

                double width = newRect.Width;
                double height = newRect.Height;
                double halfHeight = height / 2;
                int quarterHeight = (int)height / 4;

                Point pta = new Point(newRect.Right, ptaY);
                Point ptb = new Point(newRect.BottomRight.X - halfHeight, newRect.Bottom);
                Point ptc = new Point(newRect.TopRight.X - halfHeight, pta.Y + quarterHeight);
                Point ptd = new Point(newRect.Left, ptc.Y);
                Point pte = new Point(ptd.X, pta.Y - quarterHeight + 1);
                Point ptf = new Point(ptb.X, pte.Y);
                Point ptg = new Point(ptb.X, newRect.Top);

                PathGeometry pathGeometry = new PathGeometry();
                PathFigure pf = new PathFigure() { StartPoint = pta, IsClosed = true, IsFilled = true };
                PolyLineSegment pls = new PolyLineSegment(
                    new List<Point>()
                {
                    pta,ptb,ptc,ptd,pte,ptf,ptg,pta,
                }, true);
                pf.Segments.Add(pls);
                pathGeometry.Figures.Add(pf);

                drawingContext.DrawGeometry(renderBrush, renderPen, pathGeometry);
            }
            else
            {
                Rect rect = new Rect(this.AdornedElement.RenderSize);
                Rect newRect = new Rect(rect.Right + fontSize * 0.2, ptaY - fontSize / 2, fontSize * 0.8, fontSize);

                double width = newRect.Width;
                double height = newRect.Height;
                double halfHeight = height / 2;
                int quarterHeight = (int)height / 4;

                Point pta = new Point(newRect.Left, ptaY);
                Point ptb = new Point(newRect.Left + halfHeight, newRect.Bottom);
                Point ptc = new Point(ptb.X, pta.Y + quarterHeight);
                Point ptd = new Point(newRect.Right, ptc.Y);
                Point pte = new Point(ptd.X, pta.Y - quarterHeight + 1);
                Point ptf = new Point(ptb.X, pte.Y);
                Point ptg = new Point(ptb.X, newRect.Top);

                PathGeometry pathGeometry = new PathGeometry();
                PathFigure pf = new PathFigure() { StartPoint = pta, IsClosed = true, IsFilled = true };
                PolyLineSegment pls = new PolyLineSegment(
                    new List<Point>()
                {
                    pta,ptb,ptc,ptd,pte,ptf,ptg,pta,
                }, true);
                pf.Segments.Add(pls);
                pathGeometry.Figures.Add(pf);

                drawingContext.DrawGeometry(renderBrush, renderPen, pathGeometry);
            }
        }
    }
}